IEEE Std 1562 pdf free download

IEEE Std 1562 pdf free download.Sizing of Stand-Alone Photovoltaic (PV) Systems.
4. Outline of sizing methodology
4.1 General
Part of the process of sizing of a stand-alone photovoltaic (PV) system is to determine the required number of PV modules and the capacity of the battery. Other sizing aspects include wire, charge controllers, inverters, etc., which are beyond the scope of this document. The sizing is based on a combination of worst-case solar radiation, load consumption, and system losses. (Ambient temperature is also used when sizing maximum power point tracker (MPPT) charge controllers.) This is different than sizing hybrid or grid-connected systems, where the PV array may be sized to help maximize solar energy production on an annual basis.
The PV array is sized to replace the ampere-hours (Ah) in the battery consumed by the load and to provide sufficient energy to overcome system losses and inefficiencies. Any additional over-sizing of the PV array is used to recharge the battery faster after periods of low solar radiation.
Two different sizing methodologies are used in this recommended practice, both based on the average daily
load in Ah. The methodology used depends on the type of charge controller in the system. (Refer to Annex C
for more information on charge controller types.)
Module temperature deratings are considered for determining the required number of series modules and Wh production from PV arrays using MPPT charge controllers, as the temperature has a great effect on the operating voltage (and therefore power output) of a PV module.
Shading of the PV array is not addressed, and it is assumed that the PV array will not be shaded throughout the day. lithe PV array is shaded, a computer model may be needed to determine the effect of shading on the output of the PV array.
The performance of PV systems is directly dependent on the accuracy of the solar radiation data and the load consumption data used. Inaccuracies in either of these pieces of information will cause the system to be over- or under-designed.
The criticality of the application or load availability is also important. If the load is not critical and a loss of load can be tolerated, then the system can be designed more cost effectively than a critical system that requires extremely high system availability.
4.2 Sun-hour method for PV array sizing
For the purposes of this document, the daily module output is estimated by converting the solar radiation data on the plane of array (POA) into the equivalent number of sun hours of standard full solar irradiance at I kW/m2. For shunt, series, and pulse-width modulation (PWM) regulators. multiplying the number of sun hours times the rated module peak power current (from the PV module datashect) gives an estimate of the average available Ah/day production from the PV array. For MPPT controllers, multiplying the number of sun hours times the module peak power after temperature derate gives an estimate of the average available Whlday production from the PV array. The sun-hour method for PV array sizing is used in this document for sizing the PV array.
5. Load calculation
One of the most critical factors in properly sizing a stand-alone PV system is properly determining the load. If the actual load is greater than the estimated load used for sizing, the system will be under-designed. If the actual load is smaller, the system may be over-designed.
IEEE Std 1562 pdf download.